text: // Copyright 2018 Google LLC
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //      http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  #ifndef LIBRARY_COMMON_GLFW_KEYBOARD_HOOK_HANDLER_H_
  #define LIBRARY_COMMON_GLFW_KEYBOARD_HOOK_HANDLER_H_
  
  #include <GLFW/glfw3.h>
  
  namespace flutter_desktop_embedding {
  
  // Abstract class for handling keyboard input events.
  class KeyboardHookHandler {
   public:
    // A function for hooking into keyboard input.
    virtual void KeyboardHook(GLFWwindow *window, int key, int scancode,
                              int action, int mods) = 0;
  
    // A function for hooking into unicode code point input.
    virtual void CharHook(GLFWwindow *window, unsigned int code_point) = 0;
  };
  
  }  // namespace flutter_desktop_embedding
  
  #endif  // LIBRARY_COMMON_GLFW_KEYBOARD_HOOK_HANDLER_H_
  